Gauss-Hermite quadrature
Tests for Gauss-Hermite quadrature
Fix various typesetting bugs in quadrature
Add generalized Gauss Laguerre quadrature rule
Improve doc of quadrature rules
Add weight formulae to doc
Add Gauss-Chebyshev quadratures
Gauss-Jacobi quadrature
Tests for Chebyshev nodes and weights
Tests for generalized Laguerre rule
Tests for Jacobi quadrature
Quadrature doc add references
Fix doctest failures
Merge pull request #1768 from raoulb/hermite_quadrature

More Gauss quadrature

More Gauss quadrature rules:
    Gauss-Hermite
    generalized Gauss-Laguerre
    Gauss-Chebyshev for T_n and U_n
    Gauss-Jacobi (Gauss-Gegenbauer as special case)